ELFT HÍRADÓ

[<vera.horvath AT eli-alps.hu>]

Előadó: Sargis Ter-Avetisyan (ELI-ALPS)
Cím: Perspectives of Ion Acceleration

Időpont: 2017. október 13. 9 óra
Helyszín: ELI-ALPS konferenciaterme, Szeged, Budapesti út. 5.

Absztrakt:
Experiments on ion acceleration driven by high intensity lasers over the past
∼15 years have demonstrated the generation of multi-10s of MeV proton and ion
beams with remarkable properties such as ultrashort burst emission, high
brilliance, and low emittance over a wide range of laser and target
parameters.
Nowadays accessible intensities, beyond 1020 W/cm2, have provided for the
first time the opportunity to extend scaling laws for the acceleration
process, and to access new ion acceleration regimes. After short survey of
relevant background, this presentation will discuss the recent experimental
findings and also on ion acceleration obtained on PW laser. In most laser-
driven ion acceleration studies the sheath field established by relativistic
electrons at target surface accelerates ions, via the so-called Target Normal
Sheath Acceleration (TNSA). A separate mechanism, Radiation Pressure
Acceleration (RPA), has attracted extensive theoretical attention in recent
years. Radiation pressure is exerted via laser ponderomotive force on a foil
surface, which results in local electron-ion displacement, and ion
acceleration via the ensuing space-charge field. In newly found scenario at PW
laser power, which offers more favorable proton energy scaling with laser
intensity than “ordinary” TNSA, the ions are accelerated in the electrostatic
field of charged cavity created by relativistic laser pulse at the target
front and in the enhanced sheath field at the target rear.
These developments have stimulated the emergence of a new ideas and advanced
diagnostic development for measuring plasma effects and secondary source
emission with high dynamic range, spatial and spectral resolution, on a single
shot basis, also in order to benchmark simulations. We will discuss the
comprehensive on-line diagnostic systems allowing an extensive and thorough
research of laser-plasma processes, providing essential information on their
complex dynamics, characterization of the ion emission and accelerated beam
properties.
This presentation is closely related to recent development or imminently
anticipated development of laser technology to bring the existing laser
systems to a multi-PW level. Recent findings pave a way to achieving an ion
source and beam desire parameters and they encourage further activities for
optimisation of laser plasma-based accelerators.

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